Etude moleculaire de l'organisme de type bacterien (BLO) associe a la maladie du greening des agrumes : sondes ADN pour la caracterisation et la detection du BLO

Diplôme : Dr. d'Universit

Purification of the bacterium-like organism associated with greening disease of citrus by immunoaffinity chromatography and monoclonal antibodies

International audienc

Nature of the greening bacterium-like organism (BLO) : taxonomic characterization by use of cloned DNA fragments

International audienc

Detection of several strains of the bacterium-like organism of citrus greening disease by DNA probes

International audienc

The genome of the non-cultured, bacterial-like organism associated with citrus greening disease contains the nusG-rplKAJL-rpoBC gene cluster and the gene for a bacteriophage type DNA polymerase

International audienc

Serological and molecular reagents for the detection and characterization of the bacterium-like organism (BLO) of citrus greening disease

National audienc

Can colony resizing represent a strategy for octocorals to face climate warming? The case of the precious red coral Corallium rubrum

Modular colonial benthic organisms exhibit high phenotypic plasticity, which is considered an effective strategy when faced with fluctuations in abiotic and biotic factors. However, when environmental changes occur abruptly, organisms' adaptive capabilities can be limited, leading to the death of some colonies or to mass mortalities. Additionally, a decrease in body size has been proposed as one of the most common responses in both terrestrial and aquatic organisms to face global warming. Here, temperate corals' response to thermal stress was documented using the precious red coral Corallium rubrum as a model species. The increased frequency of marine heat waves recorded in the north-western Mediterranean has led to a decrease in the total number of colonies of the analysed populations and reduced colony size in those that have survived, likely through fragmentation and branch loss. The laboratory analyses carried out on collected fragments showed an unexpected swelling, similar to resorption. Additionally, the occurrence of regular sclerite-like protuberances, typical of a normal skeleton surface, suggested a regeneration process. The documented phenomenon supports the hypothesis that C. rubrum exhibits an adaptive behaviour via the autotomy of branches, providing it with an unexpected resilience against climate anomalies thanks to phenotypic plasticity